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Acquisitions - Purchase Price Allocation (Details) - Acquisitions 2017
$ in Millions
 6 Months Ended
Jun. 30, 2017
USD ($)
Business Acquisition [Line Items]  
Cash paid for acquisition of businesses $ 87.6
Non-monetary consideration 4.3
Estimated purchase price 91.9
Assets acquired:  
Property and equipment 11.2
Goodwill and identifiable intangible assets 79.4
Other current and long-term assets 8.0
Liabilities assumed:  
Long-term liabilities and deferred tax liabilities (6.7)
Estimated purchase price $ 91.9